I had tried scotch a few times in my 20s, and drank lots of Canadian whisky and bourbon around the same time, mostly mixed with ginger ale or water.
At age 40, I went to Edinburgh for vacation and thought "when in Scotland, do as the Scots", and did quite a bit of imbibing - lots of miniatures - while there. It still didn't really click with me.
When I got home, I bought a bottle of Balvenie Double Wood (the one I liked most while there), thinking that I was going to give it anoter try. Within a week or so, I was hooked. I think what the problem had been in Edinburgh was that I was just trying too many different ones. When I finally settled on one and took the time to understand it, it made all the difference.